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Bench Test Results: iJoy 40A 3000mAh 20700...third version of this battery, hugely overrated

Discussion in 'Batteries and Chargers' started by Mooch, Aug 20, 2018.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These tests below only note the ESTIMATED ratings for these batteries at the time I tested them. Any battery that is not a genuine Samsung, Sony, LG, Panasonic, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.

    Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition.

    Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.

    If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.

    F86DB9DD-71F5-4B4C-845D-1473620E2817.jpeg 35318E87-A81D-4ED3-942F-832918B13C35.jpeg 09FB3BFC-523F-4E2C-B4E0-30583A60C1EC.jpeg E1AEBC1D-C56D-4640-AFB1-6CC66AD63373.jpeg

    Bottom Line
    This is the third version of this battery. The first had a five top “leg” top contact, the second had four legs, and this one has five legs but with a small “tab” at the bottom of each cutout in the top contact.

    While these cells delivered roughly the same amount of energy as the original five leg version at moderate to high current levels (and much more than the four leg version) it did so at a MUCH higher temperature so it must be given a much lower current rating.

    There was a decent difference in performance between the two cells I tested, much more than that typically seen between cells from Samsung, Sony, etc. This makes me think these iJoy cells are manufactured in China. But I don’t know for sure.

    While the two cells I tested might be able to be given a continuous current rating between 20A and 25A I am sure they are not the hottest running cells from their batch. This forces me to rate this cell at 20A.

    The two cells I tested delivered more mAh than their rating, 3188mAh and 3176mAh at 600mA down to 2.5V. Because this cell has already changed twice I am not giving it a capacity rating above the 3000mAh rating on the wrap.

    I am ESTIMATING this iJoy’s ratings to be 20A continuous and 3000mAh.

    Two cells were donated for the purposes of testing by Dash Vapes (USA Vape Shop - Electronic Cigarettes (Ecig Mods/Liquid/Starter Kit), eJuice, Vape Mods & Liquid, Vaporizers | DashVapes - US at Thank you!

    Continuous Current Discharge Graphs
    C9BED6A5-C6F7-42BF-A8D4-0723B27B6E33.jpeg 799B153B-6D58-480F-A0E8-0F9D421160A1.jpeg

    Ratings Graphic

    Performance Specs
    - DC Internal Resistance = 23.2mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 9.4Wh (Watt-hours) average.
    - Total energy delivered down to 3.2V at 20A continuous = 7.2Wh (Watt-hours) average.

    I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon.

    To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
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  2. mimöschen

    mimöschen Ultra Member ECF Veteran

    Jul 15, 2016
    Might be an option for regulated mods.
    For mechs this cell is pure garbage.
    • Agree Agree x 2
    • Like Like x 1
  3. Robin Becker

    Robin Becker Senior Member ECF Veteran

    Feb 3, 2018
    I was wondering if they change components in their mods as fast as they do with their batteries? :w00t:
    • Funny Funny x 2
  4. Violetti Usva

    Violetti Usva Senior Member ECF Veteran

    Dec 1, 2017
    Back before I got into mech mods I bought an Ijoy MaxoZenith - three batteries in series with a potentiometer. I set it to its lowest setting on one of my rda's and it seemed fine. I put it down on my table then laid down on my bed and it lit up, autofiring, making so much noise and vapor come out of the rda that it dried and burned the wicks in the 5-10 seconds it took me to get up and remove the batteries. This makes me believe that not only was it autofiring but also at a much higher voltage than I had it set to.

    I don't think IJoy care much for safety and will never buy a product from them again - certainly not a battery. It was actually the reason I switched to mechs, as I figured that safety is entirely on me rather than a chip...
    • Agree Agree x 2
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